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pg_overexplain: Filter out actual row count from test result.

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Per buildfarm, these are not stable. In particular, 1/8 is sometimes
0.12 and sometimes 0.13.
This commit is contained in:
Robert Haas
2025-03-27 09:00:46 -04:00
parent 9fbd53dea5
commit 081ec08e6a
2 changed files with 15 additions and 9 deletions
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19
contrib/pg_overexplain/expected/pg_overexplain.out
View File

@ -61,7 +61,8 @@ INSERT INTO vegetables (name, genus)
VACUUM ANALYZE vegetables;
-- We filter relation OIDs out of the test output in order to avoid
-- test instability. This is currently only needed for EXPLAIN (DEBUG), not
-- EXPLAIN (RANGE_TABLE).
-- EXPLAIN (RANGE_TABLE). Also suppress actual row counts, which are not
-- stable (e.g. 1/8 is 0.12 on some buildfarm machines and 0.13 on others).
CREATE FUNCTION explain_filter(text) RETURNS SETOF text
LANGUAGE plpgsql AS
$$
@ -74,6 +75,8 @@ BEGIN
'Relation OIDs: NNN...', 'g');
ln := regexp_replace(ln, '<Relation-OIDs>( ?\m\d+\M)+</Relation-OIDs>',
'<Relation-OIDs>NNN...</Relation-OIDs>', 'g');
ln := regexp_replace(ln, 'actual rows=\d+\.\d+',
'actual rows=N.NN', 'g');
RETURN NEXT ln;
END LOOP;
END;
@ -387,31 +390,31 @@ SELECT * FROM vegetables v1, vegetables v2 WHERE v1.id = v2.id;
$$);
explain_filter
------------------------------------------------------------------------------------------
Nested Loop (actual rows=8.00 loops=1)
Nested Loop (actual rows=N.NN loops=1)
Disabled Nodes: 0
Parallel Safe: true
Plan Node ID: 0
-> Append (actual rows=8.00 loops=1)
-> Append (actual rows=N.NN loops=1)
Disabled Nodes: 0
Parallel Safe: true
Plan Node ID: 1
-> Index Scan using brassica_id_idx on brassica v1_1 (actual rows=7.00 loops=1)
-> Index Scan using brassica_id_idx on brassica v1_1 (actual rows=N.NN loops=1)
Index Searches: 1
Disabled Nodes: 0
Parallel Safe: true
Plan Node ID: 2
-> Index Scan using daucus_id_idx on daucus v1_2 (actual rows=1.00 loops=1)
-> Index Scan using daucus_id_idx on daucus v1_2 (actual rows=N.NN loops=1)
Index Searches: 1
Disabled Nodes: 0
Parallel Safe: true
Plan Node ID: 3
-> Append (actual rows=1.00 loops=8)
-> Append (actual rows=N.NN loops=8)
Disabled Nodes: 0
Parallel Safe: true
Plan Node ID: 4
extParam: 0
allParam: 0
-> Index Scan using brassica_id_idx on brassica v2_1 (actual rows=0.88 loops=8)
-> Index Scan using brassica_id_idx on brassica v2_1 (actual rows=N.NN loops=8)
Index Cond: (id = v1.id)
Index Searches: 8
Disabled Nodes: 0
@ -419,7 +422,7 @@ $$);
Plan Node ID: 5
extParam: 0
allParam: 0
-> Index Scan using daucus_id_idx on daucus v2_2 (actual rows=0.12 loops=8)
-> Index Scan using daucus_id_idx on daucus v2_2 (actual rows=N.NN loops=8)
Index Cond: (id = v1.id)
Index Searches: 8
Disabled Nodes: 0

5
contrib/pg_overexplain/sql/pg_overexplain.sql
View File

@ -33,7 +33,8 @@ VACUUM ANALYZE vegetables;
-- We filter relation OIDs out of the test output in order to avoid
-- test instability. This is currently only needed for EXPLAIN (DEBUG), not
-- EXPLAIN (RANGE_TABLE).
-- EXPLAIN (RANGE_TABLE). Also suppress actual row counts, which are not
-- stable (e.g. 1/8 is 0.12 on some buildfarm machines and 0.13 on others).
CREATE FUNCTION explain_filter(text) RETURNS SETOF text
LANGUAGE plpgsql AS
$$
@ -46,6 +47,8 @@ BEGIN
'Relation OIDs: NNN...', 'g');
ln := regexp_replace(ln, '<Relation-OIDs>( ?\m\d+\M)+</Relation-OIDs>',
'<Relation-OIDs>NNN...</Relation-OIDs>', 'g');
ln := regexp_replace(ln, 'actual rows=\d+\.\d+',
'actual rows=N.NN', 'g');
RETURN NEXT ln;
END LOOP;
END;